An error occured while updating your document

Hi. I just experienced a new hurdle. When i add citations or want to update the bibliography, a pop up opens saying: An error occured while updating your document. Would you like to see the error handling manual?
(It's in German). My document consists of 60 pages and pica and tables. I copied all into a doc already, saved a copy closed zotero and word...still this occurs. I have worked on this document for 4 months and never had that before. Can anyone help? urgently?
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